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Re: Video driver thoughts
Posted: 30 Nov 2018 12:39
by PhilC
Well done Chris, Is there any further testing you'd like us to carry out with the current board? or should we now wait for the next revision?
Re: Video driver thoughts
Posted: 30 Nov 2018 12:45
by exxos
Forgottenmyname wrote: 30 Nov 2018 12:39
Well done Chris, Is there any further testing you'd like us to carry out with the current board? or should we now wait for the next revision?
I don't think there is anything much else to try currently...
You could try adding the 75R resistors in series with the RGB lines and the 47pF caps to see if it makes any difference in video quality at all. ( Note that you may well have 33R already in series).
Re: Video driver thoughts
Posted: 30 Nov 2018 13:59
by exxos
V3 board if anyone wants to get one made.
VIDEO_DACv3.zip
Re: Video driver thoughts
Posted: 30 Nov 2018 21:56
by kodak80
v3 boards ordered from OSH Park. :D
Is there a component list available?
Re: Video driver thoughts
Posted: 30 Nov 2018 22:15
by exxos
kodak80 wrote: 30 Nov 2018 21:56
v3 boards ordered from OSH Park. :D
Is there a component list available?
Code: Select all
Part Value Device Package Library Sheet
BLANK 1,6/0,8 1,6/0,8 wirepad 1
C1 2.2uf C-EUC0805 C0805 rcl 1
C2 2.2uf C-EUC0805 C0805 rcl 1
C3 50pF C-EUC0805 C0805 rcl 1
C4 50pF C-EUC0805 C0805 rcl 1
C5 50pF C-EUC0805 C0805 rcl 1
C6 2.2uf C-EUC0805 C0805 rcl 1
C8 10uf C-EUC1206 C1206 rcl 1
C10 2.2uf C-EUC0805 C0805 rcl 1
CN1 HDR-1X3-MTA-100 MTA-100-3V con-hdrs40 1
IC1 STV8438CVQFP44_LARGE STV8438CVQFP44_LARGE PQFP44_LARGE Atari_MB_fixed2018v2 1
JP1 JP2E JP2 jumper 1
R1 75 R-EU_R1206 R1206 rcl 1
R2 75 R-EU_R1206 R1206 rcl 1
R3 75 R-EU_R1206 R1206 rcl 1
SHIFTER SHIFTER SHIFTER DIL40 Atari_MB_fixed2018v2 1
STF SHIFTER SHIFTER DIL40 Atari_MB_fixed2018v2 1
v3.png
BTW - I already sent your V2 PCB + chip :lol:
Re: Video driver thoughts
Posted: 30 Nov 2018 22:25
by kodak80
Cool, thank you. I will wait for these to arrive :D
Re: Video driver thoughts
Posted: 30 Nov 2018 22:39
by exxos
BTW - 50pF can also be 47pF is the value is hard to find. I've not looked for any of the parts yet...
Re: Video driver thoughts
Posted: 01 Dec 2018 00:13
by kodak80
The STV8438CV chip does seem to be very hard to find with Google and non-existent on Mouser.
Re: Video driver thoughts
Posted: 01 Dec 2018 02:04
by PaulJ
kodak80 wrote: 01 Dec 2018 00:13
The STV8438CV chip does seem to be very hard to find with Google and non-existent on Mouser.
Here ya go Kodak..
https://www.exdwh.com/data/STV8438CV.pdf
Re: Video driver thoughts
Posted: 01 Dec 2018 09:16
by Icky
exxos wrote: 30 Nov 2018 13:59
V3 board if anyone wants to get one made.
I take it this is just a neater version of the V2.patch board without the large caps.
V2.patch board :)
IMG_3353.png